Which one is correct?
1. Choose the right word from the brackets to complete the sentences.
2. Choose the correct word from the brackets to complete the sentences.
I agree with albertino.
Dawood, if you would like David's help you could message him.
another vote for the adjective "correct"
The reason that some speakers might choose 'correct' over 'right' has to to with semantics, meaning, or rather contextual meaning: what sounds "right" to me, for example, may not sound "right" to someone else. The word 'correct' on the other hand has a sense of authority to it; i.e., what the teacher or grammar deems as "right".
Having said that, given the "context" (e.g., a test situation), the assumption or pragmatics of the language is that 'right' means 'correct', and hence the validity of either or being a valid choice for the example sentences given in post #1.